Internal-combustion engine.



-A. G. ROTH. "-INTER'NAL COMBUSTION ENGINE. APPLICATION FILED JAN- 2.I913. Lfimfiwh Patented Apr. 3,1917.

2 SHEETS-*SHEET l- WITNESSES lNVEA TOR Allamey A. G. BOTH. INTERNALCOMBUSTION ENGINE. APPLICATlOI! man JAN, 2. 1913. 1 221 094; PatentedApr, 3, 1917.

2 SHEETS-SHEET 2.

WITNESSES H mmwzwc i ders 8 t idi'lildtfl lllihdi ALEERT G. RUTH, OFDRAKE, NORTH DAKOTA.

INTERNAL-COMBUSTION ENGINE.

Application filed January 2, 1913. Serial No.

To all whom it may, concern."

lie it known that l, [runner G. ROTH, a citizen of the United .llrakc,in the county of lilcllenry and State of North Dakota, have invented newand useful improvements in lnternal-Combustion lhigines, of which thefollowing is a specification.

lily present invention relates to internal i combustion engines of themultiple cylinder type, including a plurality of drive shafts. Theprincipal object of my invention is to provide an engine of thecharacter described in which the cylinders have a common combustionchamber, the inletand exhaust ports of which are controlled by movementol. one of the engine crank shafts, so that the pistons move in unisonfor the in take, compression, power and exhaust strokes. With this endin view, I so dispose the cylinders that the axes of their boresconverge toward the co'mluistion chamber, and thus atain a furtherobject,-to condense the engine to a minimum magnitude consistent withother desirable features to be hereinafter more. specifically set forth.

in tl 4 drawings, forming a part of this :tion: i

' through a multiple cylinder-engine con- "rd according-to my invention.

is a sectional view on the line 2&2 l. 3 a lfihagiuentary view showingi..isu1 for imparting movement of the cu ue drive shaft to valveactuating mcchanism. at a g'iositive velocity ratio.

in the drawings, where similar characters rei'er iii'isiniilar arts, atdesignates a base having bearings 'liir crank shafts 5, disposed inparallelism. and prefe'alily pri'ividing a crank case 6 within which thecrank pins 7 oi" shafts umke their phases of rotation.

liiouuted uponhase 4 are jacketed cylinhe lie-res of which open into acommon combustion chamber 9, with their axes conversing: toward saidchamber. lnternicitli iie the cylii'iders S l provide a wall 10 havingpor s l1 and 12, for intake and exlriustrros tivel of the engine, aswill l e herein-after decrihcd.

1 contain reciproeahic pas; .h in. are preferably of the trunk have conecting rods 1-1 pivoted r rennet he rods 14,- are in Specification ofLetters Patent.

States, residing at we 1 a central. vertical sectional raised by the cam27 and the Patented Apr. 3, ild l't 739,7169.

turn connected to the crank shafts 5 through the medium of the'crankpins 7.

The spark plug of the engine is designated by 15, and is preferablydisposed equidistant from each cylinder 8 at tlie head of combustionchamber 9. It is to be noted that the pressure faces of pistons 13 arein planes at right angles to the axis of symmetry common to bothcylinders and each is not at a right angle to the axis of its respectivecylinder.

The ports 11 and 12 are-controlled by valves 16 and 17, respectively,carried by reciprocable rods 18 and 19 respectively. These rods arecarried by bearings 20 and 21 and extend intermediate the cylinders 8,longitudinally thereo These valves are normally held closed by yieldablemeans, such as springs 22 confined between bearings 20 and ahutnients 23on the valve rods. 4 Disposed with its axis substantially parallel tothe axis of shaft 5 is a cam shaft 21, carried by bearings of base 4:.Two cams 26 and 27 are carried by shaft 24c for coaction with valve rods18 and 1.9, respectively, as through adjustable roller bearings 28 and29, respectively, whereby the valves may be adjusted to operate asdesired, and accord ing' to the various strokes of the engine piston.

Shaft 21- may be driven through mechanism 30, at a positive velocityratio from one of the shafts 5, this mwyhauism 3O preli erablycomprising coiuesuing.gears ll, and 33, adapted to provide a velocityratio of Q'betw'een shafts 5 and i l, in the example shown.

The operation of the engine is as follows:

As disclosed in Figs. 1 and 2 of the drawing, the pistons 13 of theengine are at the start of the intake stroke and port ll is opened, bymeans of the raising of valve 16 through cam 26. As the pistons completethe intake stroke, the roller-bearing 28 drops from the throw side ofcam 26 and port 11 is closed responsive to action of spring 22associated with the rod 18 of valve 16. The pistons then passsuccessively through the compression and power strokes, and when movingtoward combustion chamber 9 to complete the exhaust stroke the valve 17is exhaust port opened for egress of the waste products of combustion.

It is to be noted that the intake and 0X vention;

ignite the charge at a point equidistant frona'- both cylinders, hence,the pistons have 1mparted thereto substantially uniform movement by theexpanding gases resulting from the explosion.

Changes in details may be made without departing from the spirit orscope of my inbut, Iclaim: V In an internal combustion engine, incombination. a pair of cylinders having'a common combustion chamber andinclined therefrom in opposite directions, the inner opposed walls ofsaid cylinders having a common vertex, crank shaft casings spaced upon acommon base and respectively supporting said cylinders, pistons operablewithin said cylinders and adapted to have their pressure faces inlongitudinal alinementwith one another at the completion of an 'HlWilIdstroke and substantially flushed with said vertex, crank shafts operablyconnected to said pistons, valves mounted at a tween said casings andengaging said valve stems and-means for transmitting motion from saidcrank shaft to said cam shaft.

I ALBERT G. ROTH;

Witnesses: i H. A. SCI-IRADER,

OSCAR ScHmL Ne.

the said vertex of the inner opposed walls

